All scales created equal?

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Maybe a bit of a dumb question but I'm looking to buy a personal scale for myself to better track my weight. There's a lot of options on Amazon and I want something that's cheap (probs less than $20) but how do you know if it's accurate?

All reviews vary considerably about the numbers fluctuating and I want to be sure I buy something consistent. Any recommendations/ones to avoid? Or are all scales created equal?

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